Zn + H2SO4 == ZnSO4 + H2↑
65 98 161 2
m1 m2 m3 0.2g
65/m1 = 98/m2 = 161/m3 = 2/0.2
得m = 6.5g,m2 = 9.8g,m3 = 16.1g
所以ZnO质量 = 14.6-6.5 = 8.1g
ZnO + H2SO4 == ZnSO4 + H2O
81 98 161
8.1g m4 m5
81/8.1 = 98/m4 = 161/m5
得m4 = 9.8g,m5 = 16.1g
所以H2SO4溶质质量 = 9.8+9.8=19.6g
稀硫酸中溶质的质量分数 = 19.6/100 = 19.6%
反应后溶液中溶质的质量 = 16.1+16.1 = 32.2g
反应后溶液中溶质的质量分数 = 32.2/(14.6+100-0.2) = 28.1%